Limiting magnetic fields in the cosmic web with diffuse radio emission

S Brown; T Vernstrom; E Carretti; K Dolag; B. M Gaensler; L Staveley-Smith; G Bernardi; M Haverkorn; M Kesteven; S Poppi

doi:10.1093/mnras/stx746

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Limiting magnetic fields in the cosmic web with diffuse radio emission

Journal article

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Peer reviewed

Limiting magnetic fields in the cosmic web with diffuse radio emission

S Brown, T Vernstrom, E Carretti, K Dolag, B. M Gaensler, L Staveley-Smith, G Bernardi, M Haverkorn, M Kesteven and S Poppi

Monthly notices of the Royal Astronomical Society, Vol.468(4), pp.4246-4253

2017

DOI: 10.1093/mnras/stx746

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https://admin.research-repository.uwa.edu.au/en/publications/18292ece-437d-4412-95e2-67e895126819View

Open Access

Abstract

Abstract We set limits on the presence of the synchrotron cosmic web through the cross-correlation of the 2.3 GHz S-PASS survey with a model of the local cosmic web derived from constrained magnetohydrodynamic (MHD) simulations. The MHD simulation assumes cosmologically seeded magnetic fields amplified during large-scale structure formation and a population of relativistic electrons/positrons from proton–proton collisions within the intergalactic medium. We set a model-dependent 3σ upper limit on the synchrotron surface brightness of 0.16 mJy arcmin−2 at 2.3 GHz in filaments. Extrapolating from magnetic field maps created from the simulation, we infer an upper limit (density-weighted) magnetic field of 0.03 (0.13) μG in filaments at the current epoch and a limit on the primordial magnetic field (PMF) of B PMF < 1.0 nG.

radio continuum: general

intergalactic medium

magnetic fields

plasmas

galaxies: clusters: intracluster medium

large-scale structure of Universe

Details

Title: Subtitle: Limiting magnetic fields in the cosmic web with diffuse radio emission
Creators: S Brown - Iowa State University
T Vernstrom - University of Toronto
E Carretti - Commonwealth Scientific and Industrial Research Organisation
K Dolag - Max Planck Society
B. M Gaensler - University of Toronto
L Staveley-Smith - ARC Centre of Excellence for All-sky Astrophysics
G Bernardi - Rhodes University
M Haverkorn - Radboud University Nijmegen
M Kesteven - Commonwealth Scientific and Industrial Research Organisation
S Poppi - Osservatorio Astronomico di Cagliari
Resource Type: Journal article
Publication Details: Monthly notices of the Royal Astronomical Society, Vol.468(4), pp.4246-4253
DOI: 10.1093/mnras/stx746
ISSN: 0035-8711
eISSN: 1365-2966
Publisher: Oxford University Press
Grant note: RGPIN-2015-05948 / NSERC (10.13039/501100000038)
Language: English
Date published: 2017
Academic Unit: Physics and Astronomy
Record Identifier: 9984199948002771

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